Ok, lets start with an input-file.
PC-Gamess/FireFly is very flexible, it contains a lot of setting possibilities. Both, system
and calculation options. But often you need only some of them. Of course, the amount
of input-file depends of calculation type.
The ASCII-file consists of groups (_$XYZ [....] $END) which contain according settings.
Attention should be paid to a space character before every group.
There is also a possibility to insert some comments between groups (! comment).
! Short example of a H2O geometry optimization
!
$CONTRL SCFTYP=RHF RUNTYP=OPTIMIZE $END
$SYSTEM MWORDS=10 $END
$BASIS GBASIS=N21 NGAUSS=3 $END
$DATA
1st row is reserved for a comment
C1
O 8.0 0.0 0.0 0.0
H 1.0 1.0 1.0 0.0
H 1.0 -1.0 1.0 0.0
$END
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